Game of Thrones could be getting a prequel series, HBO has announced, one of five potential spinoffs of the series.
Book author George RR Martin created the new series alongside British screenwriter Jane Goldman.
HBO has ordered a pilot episode for the show, set thousands of years before the battles over the Iron Throne.
Executives say any spinoff will not be broadcast until after Game of Thrones' final season in 2019.
If picked up, the prequel will chronicle "the world's descent from the golden Age of Heroes into its darkest hour", HBO said in a statement.
